[wasm-split] Add --print-profile option (#4771)

There are several reasons why a function may not be trained in deterministically. 
So to perform quick validation we need to inspect profile.data (another ways requires split to be performed). However as profile.data is a binary file and is not self sufficient, so we cannot currently use it to perform such validation.

Therefore to allow quick check on whether a particular function has been trained in, we need to dump profile.data in a more readable format. 

This PR, allows us to output, the list of functions to be kept (in main wasm) and those split functions (to be moved to deferred.wasm) in a readable format, to console. 

Added a new option `--print-profile` 
- input path to orig.wasm (its the original wasm file that will be used later during split)
- input path to profile.data that we need to output
optionally pass `--unescape`
to unescape the function names

Usage:
```
binaryen\build>bin\wasm-split.exe test\profile_data\MY.orig.wasm --print-profile=test\profile_data\profile.data > test\profile_data\out.log
```

note: meaning of prefixes
`+` => fn to be kept in main wasm
`-` => fn to be split and moved to deferred wasm

1 files changed, 24 insertions, 0 deletions

diff --git a/src/tools/wasm-split/split-options.cpp b/src/tools/wasm-split/split-options.cpp
index b5929aad7..b8ccde83e 100644
--- a/src/tools/wasm-split/split-options.cpp
+++ b/src/tools/wasm-split/split-options.cpp
@@ -67,6 +67,9 @@ std::ostream& operator<<(std::ostream& o, WasmSplitOptions::Mode& mode) {
     case WasmSplitOptions::Mode::MergeProfiles:
       o << "merge-profiles";
       break;
+    case WasmSplitOptions::Mode::PrintProfile:
+      o << "print-profile";
+      break;
   }
   return o;
 }
@@ -105,6 +108,16 @@ WasmSplitOptions::WasmSplitOptions()
          [&](Options* o, const std::string& argument) {
            mode = Mode::MergeProfiles;
          })
+    .add("--print-profile",
+         "",
+         "Print profile contents in a human-readable format.",
+         WasmSplitOption,
+         {Mode::PrintProfile},
+         Options::Arguments::One,
+         [&](Options* o, const std::string& argument) {
+           mode = Mode::PrintProfile;
+           profileFile = argument;
+         })
     .add(
       "--profile",
       "",
@@ -278,6 +291,12 @@ WasmSplitOptions::WasmSplitOptions()
          {Mode::Instrument, Mode::MergeProfiles},
          Options::Arguments::One,
          [&](Options* o, const std::string& argument) { output = argument; })
+    .add("--unescape",
+         "-u",
+         "Un-escape function names (in print-profile output)",
+         WasmSplitOption,
+         Options::Arguments::Zero,
+         [&](Options* o, const std::string& argument) { unescape = true; })
     .add("--verbose",
          "-v",
          "Verbose output mode. Prints the functions that will be kept "
@@ -362,6 +381,11 @@ bool WasmSplitOptions::validate() {
     case Mode::MergeProfiles:
       // Any number >= 1 allowed.
       break;
+    case Mode::PrintProfile:
+      if (inputFiles.size() != 1) {
+        fail("Must have exactly one profile path.");
+      }
+      break;
   }
 
   // Validate that all used options are allowed in the current mode.